Look at who made that pyramid diagram Ethicon Endo-Surgery, (Ethicon Endo-Surgery, Inc., a subsidiary of Johnson & Johnson, is a company that designs and manufactures medical devices and surgical instruments with the intent of minimizing the invasiveness of surgery.) They sell the very expensive surgical stapling systems that enable bariatric surgery to be done quickly and endoscopically (minimally invasive surgery ( keyhole surgery)). Therefore they have a financial incentive to promote bariatric surgery. Bariatric surgery is not without risks, while newer techniques which include using the products made by Ethicon and other companies have made bariatric surgery safer than before, but it still is major surgery with significant risk mortality and morbidity.
Having worked with patients before and after bariatric surgery, I think the choice to have surgery should be undertaken only when all other non surgical options have failed. Unfortunately too many patients do not make a serious attempt to loose weight with diet and exercise, and they lack the proper support to ensure success with diet and exercise, before choosing weight loss surgery.